Abstract: The traditional impregnation method was used to support nickel ions on the metal-organic framework compound MIL-101 (Cr3F(H2O)2O[(O2C)-C6H4-(CO2)]3·nH2O, n≈25) for the preparation of a Ni/MIL-101 composite material. With two ways of impregnation (excessive impregnation and incipient wetness impregnation) followed by two ways of reduction (liquid chemical reduction and solid hydrogenation reduction), four Ni/MIL-101 samples were obtained. The hydrogen storage capacity of the Ni/MIL-101 samples was measured under mild conditions(25-100℃,0.01-4MPa). Compared with the original MIL-101, Ni/MIL-101 had high hydrogen storage capacity because of the Ni particles supported on MIL-101. Among these samples, the sample prepared by excessive impregnation followed by liquid chemical reduction exhibited the highest hydrogen storage capacity of 1.02% at 100 ℃ and 4.0 MPa.

Key words: nickel, metal-organic framework compound, supported composite material, hydrogen storage capacity, impregnation, chemical reduction, hydrogen reduction